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- 1. Multiple Choice
Why are isotopes with short half-lives not useful for dating very old rocks?because not enough of the parent isotope remains to measure accuratelybecause not enough of the daughter product has formed to be detectablebecause neither the parent isotope nor the daughter product will be detectablebecause very old rocks would never have contained these isotopes - 2. Multiple ChoiceScientists use radioactive decay to measure...relative timeabsolute timehalf-livestime of day
- 3. Multiple ChoiceThe length of time required for half of the radioactive atoms in a sample to decay is its...eraagehalf-lifeeon
- 4. Multiple ChoiceHow does absolute age differ from relative age?only absolute dating indicates which rock is older than anotheronly absolute dating finds the age in yearsonly relative dating finds the age in years
- 5. Multiple ChoiceRadiometric dating is possible because the rates of decay of radioactive isotopes _____.change over timechange from place to placeare constantvary widely
- 6. Multiple ChoiceThe time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.the daughter productgeologic timethe half-lifethe half-time
- 7. Multiple ChoiceIf the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?25 years200 years400 years800 years
- 8. Multiple ChoiceAccording to the law of superposition, the oldest fossils are foundAt the top of the rock layersNear the bottom of the rock layersIn the middle of the rock layersSomewhat near the surface
- 9. Multiple ChoiceWhich rock layer in the diagram seems to be the oldest?FEBA
- 10. Multiple ChoiceAccording to the law of superposition, which layer is the youngest?ABC
- 11. Multiple ChoiceWhich type of dating method can be used on rock layers by applying the Law of Superposition?relative datingabsolute datingradioactive datingradiometric dating
- 12. Multiple Choicestates that the geologic feature which cuts another is the younger of the two featureslaw of horizontalitycross cutting relationshipslaw of superpositionuniformitarianism
- 13. Multiple ChoiceWhich of the following is the oldest?Layer LIntrusion DIntrusion HLayer E
- 14. Multiple ChoiceWhat element is usually used to date fossils?uranium-235carbon-14mercury-203thorium-234
- 15. Multiple ChoiceLetter "F" is a....inclusionintrusionfaultunconformity
- 16. Multiple ChoiceAll plants and ANIMALS contain carbon.TrueFalse
- 17. Multiple ChoiceWhich of the following correctly lists the layers in order from oldest to youngest?A, B, C, D, EE, B, C, D, AE, D, C, B, AC, B, A, D, E
- 18. Multiple ChoiceHow old is the Earth?4.6 billion years1.4 billion years4.6 million years6000 years
- 19. Multiple ChoiceWhat is the oldest layer in the outcrop?BCDE
- 20. Multiple ChoiceTraces or remains of organisms that lived long agoFossilUnconformitySuperpositionColumn
- Answer choicesTagsAnswer choicesTags